. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 144 SALLY KELLY addition of succinic and fumaric acids were successful only when the intermediates were present from the start along with the inhibitor (Fig. 2). These results suggest that heavy metal enzymes, dehydrogenases, and glycolases are functioning in Ascophyllum segments. Anaerobically the segments utilized malic acid, glucose and pyruvic acid, in the order given, while respiring in nitrogen when carbon dioxide production was followed from a bicarbonate buffer. The amount of iodine131 taken up from van't Hoff sea wa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 144 SALLY KELLY addition of succinic and fumaric acids were successful only when the intermediates were present from the start along with the inhibitor (Fig. 2). These results suggest that heavy metal enzymes, dehydrogenases, and glycolases are functioning in Ascophyllum segments. Anaerobically the segments utilized malic acid, glucose and pyruvic acid, in the order given, while respiring in nitrogen when carbon dioxide production was followed from a bicarbonate buffer. The amount of iodine131 taken up from van't Hoff sea water by the segments in- creases up to the first hour of exposure to the element; beyond that time no further increase in radioactivity takes place. Since the segments already had iodine in. 0 123456 HOURS FIGURE 4. Uptake and removal from solution of radioactive iodine by Ascophyllum seg- ments in the presence of sodium azide, M. Segments in van't Hoff sea water minus cal- cium, containing iodide. them, having lived in natural sea water until the experimental period, the removal of radioactive iodine has been interpreted as meaning that iodine in the solution is be- ing exchanged for iodine in the segments (Kelly and Baily, 1951). When the ratio of iodine131 to iodine128 inside the segments becomes equal to the same ratio outside, then net changes in radioactivity cease, indicating an equilibrium has been reached. When glucose and sucrose were added to the solution in a concentration of M the uptake of iodine was stimulated, as measured by the increase in radio- active iodine in the segments and its decrease in the solutions. This stimulation was apparent more or less immediately (Fig. 3). Potassium cyanide, iodoacetic acid and sodium azide inhibited iodine uptake (Fig. 4). A comparison of the in-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of thes
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